Background: The dissolution of the Austro-Hungarian Empire at the close of World War I allowed the Slovaks to join the closely related Czechs to form Czechoslovakia. Following the chaos of World War II, Czechoslovakia became a Communist nation within Soviet-dominated Eastern Europe. Soviet influence collapsed in 1989 and Czechoslovakia once more became free. The Slovaks and the Czechs agreed to separate peacefully on 1 January 1993. Slovakia joined both NATO and the EU in the spring of 2004 and the eurozone on 1 January 2009.